If a plant is only given sunlight and water, it can't make sugars through photosynthesis Why?
The reason is because photosynthesis occurs along with sunlight, water and also carbon dioxide. Plants use chlorophyll to make sugar, glucose, and also produce oxygen as a waste product. Read more at http://www.ehow.com/way_5523408_plant-photosynthesis-experiments.html.
It also needs certain minerals for the process.
I think it also needs certain minerals from the soil? But I know that it definitely also needs carbon dioxide.